Menstral-like cramps and lower back pain...

Kristen • Momma to 3 beautiful girls (2 of which are identical twins). Trying for final pregnancy (hopefully a boy!)

Man, I'm 13 weeks 1 day and for the past couple of days I've had some pretty good menstral-like cramps and lower back pain... nothing I can't handle but it's making me nervous. Is it normal?